公开(公告)号：US12129557B2

公开(公告)日：2024-10-29

申请号：US17275123

申请日：2019-09-03

申请人： DAIDO STEEL CO., LTD. ,  JATCO Ltd

发明人： Junya Miyauchi ,  Kohei Yamaguchi ,  Ryohei Ishikura ,  Keiichiro Kamiya ,  Hiroki Terada ,  Kazumasa Uchida ,  Yasuo Ito ,  Hiroaki Toyota ,  Shunsuke Ohshima

IPC分类号： C23C8/22 ,  C21D6/00 ,  C21D8/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/48

CPC分类号： C23C8/22 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/48

摘要： A high surface-pressure resistant component includes a steel having a composition containing, in mass %, 0.17-0.23% of C, 0.80-1.00% of Si, 0.65-1.00% of Mn, 0.030% or less of P, 0.030% or less of S, 0.01-1.00% of Cu, 0.01-3.00% of Ni, and 0.80-1.00% of Cr, with the remainder being Fe and unavoidable impurities, in which the surface layer C concentration of a carburized and quenched layer is 0.70-0.80% in mass %.

公开(公告)号：US20240247331A1

公开(公告)日：2024-07-25

申请号：US18392820

申请日：2023-12-21

申请人： DAIDO STEEL CO., LTD.

发明人： Daisuke KUDO ,  Nobuyuki TAKAHASHI ,  Tomohiro ANDO ,  Yoshihiko KOYANAGI

IPC分类号： C21D8/00 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

CPC分类号： C21D8/005 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C21D2211/008 ,  C22C2202/04

摘要： The present invention relates to an austenitic stainless steel for high-pressure hydrogen gas or liquid hydrogen, having a composition consisting of: C≤0.20 mass %, 0.10 mass %≤ Si≤1.00 mass %, 0.10 mass %≤Mn≤2.0 mass %, P≤0.050 mass %, S≤0.050 mass %, 2.0 mass %≤Cu

公开(公告)号：US20240200179A1

公开(公告)日：2024-06-20

申请号：US18287521

申请日：2022-04-08

申请人： DAIDO STEEL CO., LTD.

发明人： Yukihiro HAYASHI ,  Kenta TSUJII

IPC分类号： C22C38/58 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C23C8/32

CPC分类号： C22C38/58 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C23C8/32

摘要： The present invention relates to a steel material for carbonitriding treatment, containing: C, Si, Mn, P, S, Cu, Ni, Cr, Mo, Al, and N with a balance being Fe and inevitable impurities, satisfying Expression 1 of 0.6 to 1.4 and Expression 2 of >560 when subjected to carbonitriding, Expression 1: Surface C concentration (mass %)+12/14×Surface N concentration (mass %), and Expression 2: 129.7805×[Cr (mass %)]−76.9797×[Cr (mass %)]2+339.3375×[Surface N concentration (mass %)]−539.345×[Surface N concentration (mass %)]2+181.4983×[Cr (mass %)]×[Surface N concentration (mass %)]+437.6799, and providing a carbonitrided steel material having a hardness of 560 HV or more at a portion from a surface thereof to a depth of 0.05 mm when subjected to a tempering treatment at 500° C. after the carbonitriding.

公开(公告)号：US20240150881A1

公开(公告)日：2024-05-09

申请号：US18384167

申请日：2023-10-26

申请人： DAIDO STEEL CO., LTD.

发明人： Chihiro FURUSHO ,  Yoshihiko KOYANAGI

IPC分类号： C22C38/60 ,  C21D1/84 ,  C21D6/00 ,  C21D8/06 ,  C21D9/52 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/54

CPC分类号： C22C38/60 ,  C21D1/84 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/065 ,  C21D9/525 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/54 ,  C21D2211/005

摘要： The present invention relates to a ferritic free-cutting stainless steel material having a component composition contains: in terms of mass %, 10.0%≤Cr≤25.0%, 0.2%≤Mn≤2.0%, 0.30%≤Al≤2.50%, 0.02%≤Si≤0.60%, and 0.10%≤S≤0.45%, and further two or more selected from the group consisting of: 0.03%≤Pb≤0.40%, 0.03%≤Bi≤0.40%, and 0.01%≤Te≤0.10%, with a balance being Fe and unavoidable impurities. The component composition satisfies: 900([C]+[N])+170[Si]+12[Cr]+30[Mo]+10[Al]≤300, and ([Cr]+[Mo]+1.5[Si]+4[Al])/([Ni]+0.5[Mn]+30[C]+30[N])≥7. The ferritic free-cutting stainless steel material contains sulfides having a circle equivalent diameter of 1.5 μm or more, and the sulfides have an average circle equivalent diameter of 3.0 to 15.0 μm, an average aspect ratio of 2.5 or less, and an area ratio of 0.5 to 2.0%, and the maximum value of Vickers hardness of 170 HV or less.

公开(公告)号：US20240102140A1

公开(公告)日：2024-03-28

申请号：US18370225

申请日：2023-09-19

申请人： DAIDO STEEL CO., LTD.

发明人： Masamichi KAWANO

IPC分类号： C22C38/44 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/46

CPC分类号： C22C38/44 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/46

摘要： The present invention relates to a steel material including: 0.25 mass %≤C≤0.37 mass %; 0.08 mass %≤V≤0.28 mass %; 6.60 mass %≤Mn+Cr≤7.40 mass %; Mn/Cr≤0.150; Mn≥0.60 mass %; Cr≤6.60 mass %; Cu+Ni≤0.84 mass %; 0.40 mass %≤Si≤0.90 mass %; 0.60 mass %≤Mo≤2.00 mass %; 0.001 mass %≤Al≤0.080 mass %; and 0.003 mass %≤N≤0.040 mass %, with the balance being Fe and unavoidable impurities.

公开(公告)号：US11834737B2

公开(公告)日：2023-12-05

申请号：US16089241

申请日：2017-03-29

申请人： DAIDO STEEL CO., LTD.

发明人： Hiromasa Takeda ,  Wataru Araki ,  Kazuya Sakaguchi ,  Katsuko Ofuji ,  Jun Totsuka ,  Kazuki Minami

IPC分类号： C23C14/00 ,  C23C14/06 ,  C23C14/34 ,  C22C14/00

CPC分类号： C23C14/0641 ,  C22C14/00 ,  C23C14/3414

摘要： The titanium alloy coating film of the present invention is represented by (Ti1-aMoa)1-xNx, which satisfies 0.0423 a≤0.32 and 0.40≤x≤0.60 and in which the film hardness thereof satisfies at least a condition of 3,000 HV or more; and the titanium alloy target material is represented by Ti1-aMoa, which satisfies 0.04≤a≤0.32, and in which, when an X-ray diffraction profile is measured on a surface of the target material, a diffraction peak intensity attributed to a single metal phase of Mo is not detected.

公开(公告)号：US20230235422A1

公开(公告)日：2023-07-27

申请号：US18097936

申请日：2023-01-17

申请人： Daido Steel CO., Ltd.

发明人： Koichiro ASAI

IPC分类号： C21D9/00

CPC分类号： C21D9/0056 ,  C21D9/0062

摘要： The present invention relates to a motor core production method including: a preparation step of preparing a laminate of electromagnetic steel sheets each processed into a predetermined shape; a first heating step of heating the laminate at an atmospheric temperature of 500° C. to 800° C. in an atmospheric gas comprising at least one kind selected from the group consisting of a low oxidizing gas and a reducing gas, and having a dew point of −20° C. or lower; and a second heating step of soaking the laminate at 1,000° C. to 1,200° C. in a vacuum of 100 Pa or less after the first heating step, and a heat treatment device for performing the production method.

公开(公告)号：US11535917B2

公开(公告)日：2022-12-27

申请号：US16952994

申请日：2020-11-19

申请人： DAIDO STEEL CO., LTD.

发明人： Naoki Umemori ,  Shigeki Higuchi

IPC分类号： C22C38/60 ,  B33Y70/00 ,  B22C9/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/38

摘要： The present invention relates to a steel for mold, containing: 0.28 mass %≤C≤0.65 mass %, 0.01 mass %≤Si≤0.30 mass %, 1.5 mass %≤Mn≤3.0 mass %, 0.5 mass %≤Cr≤1.4 mass %, 1.9 mass %≤Mo+W/2≤4.0 mass %, 0.2 mass %≤V≤1.0 mass %, and 0.01≤N≤0.10 mass %, with the balance being Fe and inevitable impurities, in which, in a state after quenching and tempering, the steel has: a (Mo, W) carbide having a diameter of 0.2 μm or less being in an amount of 1.2 mass % or more, a ratio (mass ratio) of the amount of the (Mo, W) carbide to an amount of a Cr carbide being 11 or more, and a hardness change of 15 HRC or less.

公开(公告)号：US20220288677A1

公开(公告)日：2022-09-15

申请号：US17689722

申请日：2022-03-08

申请人： DAIDO STEEL CO, LTD.

发明人： Koichiro SEKIMOTO ,  Daisuke KANAI ,  Teruki USUDA ,  Toshiyuki YAMANAKA ,  Takuya SAKAI ,  Shinnosuke YAMADA

IPC分类号： B22F1/052 ,  B22F1/054 ,  B22F9/08

摘要： The present invention relates to a powder material including metal particles, in which in a mass basis cumulative particle size distribution, the metal particles have a 10% particle diameter d10 of less than 16 μm and a 90% particle diameter d90 of more than 35 μm and when a specific energy obtained as a value yielded by dividing a flow energy measured as an energy acting on a blade spiraling upward in the powder material by a mass of the powder material is normalized with a bulk density of the powder material, a resulting value is less than 0.47 mJ·ml/g2 and relates to a producing method for the same.

公开(公告)号：US20220162732A1

公开(公告)日：2022-05-26

申请号：US17529849

申请日：2021-11-18

申请人： DAIDO STEEL CO., LTD.

发明人： Masamichi KAWANO

IPC分类号： C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

摘要： The present invention relates to a steel for a mold, including 0.070≤C≤0.130 mass %, 0.01≤Si≤0.60 mass %, 0.02≤Mn≤0.60 mass %, 0.003≤P≤0.150 mass %, 0.005≤Cu≤1.50 mass %, 0.005≤Ni≤0.80 mass %, 7.50≤Cr≤8.40 mass %, 0.70≤Mo≤1.20 mass %, 0.01≤V≤0.30 mass %, 0.010≤Al≤0.120 mass %, and 0.015≤N≤0.095 mass %, with the balance being Fe and unavoidable impurities. The steel for a mold according to the present invention satisfies all of 6 properties of SA property, tempering hardness, residual stress, machinability, impact value and corrosion resistance.